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Difficulty: MediumCorrelation vs. Causation

Botanist: A recent survey of the Blackwood Forest revealed a consistent pattern regarding the Xanthoria lichen. Specifically, the areas of the forest with the highest concentration of this lichen on tree trunks are precisely the areas where the average pine tree bark is substantially thicker than in the rest of the forest. Therefore, it is clear that the presence of Xanthoria lichen stimulates the pine trees to produce thicker layers of bark as a protective response.

Which one of the following most accurately describes a flaw in the botanist's reasoning?

  1. It overlooks the possibility that trees possessing naturally thicker bark offer a more hospitable surface, which in turn encourages the heavy growth of the lichen.Answer
  2. B
    It treats a condition that is merely sufficient to cause bark thickening as a condition that is strictly necessary for it.
  3. C
    It relies on the unstated assumption that overall environmental conditions in the Blackwood Forest are identical to those in other forests.
  4. D
    It mistakes a claim about the percentage of trees covered in lichen for a claim about the absolute total number of such trees in the forest.
  5. E
    It fails to distinguish between a background premise describing the lichen's distribution and the ultimate conclusion drawn from that distribution.

Answer

The argument overlooks the possibility that trees possessing naturally thicker bark offer a more hospitable surface, which in turn encourages the heavy growth of the lichen.
The correct answer accurately diagnoses the classic correlation-to-causation fallacy present in the stimulus. The botanist observes that two phenomena occur together (thick bark and lichen density) and hastily concludes that the lichen causes the thick bark. The correct answer highlights the possibility of reverse causality: the thick bark might actually be the cause of the dense lichen growth.

Step-by-Step Solution

1
Analyze the structure of the argument.
Premise: High lichen concentration correlates with thicker tree bark. Conclusion: Lichen causes the trees to produce thicker bark.
Identifying the premise and the conclusion is required to evaluate the validity of the reasoning.
2
Identify the logical flaw connecting the premise to the conclusion.
The argument moves from a simple correlation to a definitive causal relationship (A causes B).
Recognizing this jump highlights the classic 'Correlation vs. Causation' flaw.
3
Determine alternative explanations for the correlation.
It is entirely possible that B causes A (reverse causality): the thicker bark might be the very reason the lichen is able to grow so densely in those areas.
Finding alternative explanations demonstrates why the author's strict causal conclusion is unwarranted.
4
Select the option that best describes this specific causal flaw.
The correct option points out the reverse causality scenario, exposing the vulnerability in the botanist's reasoning.
This directly answers the question asked in the stem.

Key Concept

Correlation vs. Causation (Reverse Causality)
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Topics

Correlation vs. Causation

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